52. ? Sabinotrochus bipatella n. sp. Plate IV. Fig. 25, 25a. 



Stat. 52. 9°3'.4S., [I9°56'.7E. 959 m. 1 Ex. 



Corallum discoidal, with a scar of attachment ; granular costae are present, bul are 

 distinct only in the peripheral half of the disk. 



Septa in six systems and three cycles, with traces of a fourth. Those of the first cycle 

 are the largest and stoutest. Those of the first two cycles unite to form a thin undermined 

 disk-like columella, which half fills the shallow calicular fossa. Those of the third cycle do nol 

 unite with those of the second, though they tend to curve towards them ; they do not usually 

 reach the columella. 



Heieht of corallum about 2 millim. 

 Diameter of disk „ 8 „ 



XVI. Discotrochus Edw. & H., Duncan. 



The collection contains clead coralla of two species one of which is undoubtedly, the 

 other doubtfully, referable to this genus. 



33. Discotrochus dentatus n. sp. Plate IV. Fig. 26, 26a. 



Stat. 95. 5°43'-5 N., ii9°4o' E. 522 m. 4 Ex. 

 Stat. 98. 6° 9' N., I20°2i' E. 350 m. 3 Ex. 

 Stat. 100. 6° 11' N., i20°3/'.5E. 459 m. 1 Ex. 



Nearly related to D. investigatoris mihi (Journ. Asiatic Soc. Bengal, LXII, pt. 2, 1893, 

 p. 142, PI. V, Fig. 5, 5a) from which it differs in having the septa less crowded though 

 more numerous. 



Corallum quite flat and discoidal, of thick coarse texture. On the horizontal base is a 

 faint scar of attachment from which numerous equal well-cut costae radiate. 



Septa hardly exsert beyond the thick peripheral margin, in six systems and five cycles, 

 the fifth cycle being incomplete in a few of the half-systems. The septa of the fifth cycle are 

 thin, but those of all the other cycles are coarse and have their edges deeply and coarsely 

 serrated throughout. Though the septa of the first cycle are distinctly the largest, those of the 

 second and even of the third cycle are not very much smaller. There is no union of septa, 

 except at the columella, where those of the first three cycles, and usually of the fourth cycle 

 also, meet. 



The columella, which is small and fascicular and consists of little but the united ends 

 of the septa, is studded with a few coarse subprismatic granules. 



The diameter of the disk of the largest specimen is 19 millim. 



34. ? Discotrochus sp. 



Stat. 95. 5°43'.5 N., 11 9° 40' E. 522 m. 2 Ex. 

 This is a little clead and eroded corallum, and cannot be accurately placed. It is solid, 



